weird rigging problem
Your mesh have too many unrelated bone influences.  Your best bet at this point:


Get into weight painting mode
Select all the bones
Hit W >> Assign Automatic from Bones.
Viewport menu >> Weights >> Normalize All.


If you do make any adjustments, make sure the brush is set to 'Add' and make the power 1.0.  The lion's share of weight-painting can be done this way.

Slightly unrelated: the model has way too much geometry for the detail that it has, and you can likely half, even quarter the amount of faces you have without losing any meaningful features.  This will ease up on your filesize, and viewport performance.  You should also give your bones meaningful names (Femur.R, not Bone.004).